The Natural History of Se I borne 299 



cannot suppose, that after a month's absence, house-martins 

 can return from southern regions to appear for one morning 

 in November, or that house-swallows should leave the districts 

 of Africa to enjoy in March the transient summer of a couple 

 of days. 1 I am, &c. 



1 In such cases the birds on their way south are probably tempted a little 

 north again for a short period by an increased temporary supply of food- 

 stuffs. ED. 



